ASHRAE Journal - July 2014 - 12

Letters

to reintroduce this concept to the modern engineering community. In 1982, William J. Coad, P.E., J. Barrie
Graham, P.E.,  and I were preparing the content for the
first ASHRAE Professional Development Seminar Series
entitled "Air System Design and Retrofit for Energy/Cost
Effectiveness." The issue of air-handling unit selection
based on coil face velocity was very much on our minds
since many calculations on previous projects we were
involved in indicated, from a return on investment basis,
that lower face velocities than 500 fpm often made good
economic sense when the cost of energy was considered.
As we struggled to develop a uniform logic for making this calculation, we ran across what I believe to be
a landmark article in the June 1977 ASHRAE Journal.  The
article was entitled "Air-Handling Unit Design for
Energy Conservation" written by Arthur E. Wheeler
(www.ashrae.org/ashraejournal).  In the article, Mr.
Wheeler used a present worth economic analysis of
the first cost and energy cost over a five-year period
to determine the optimum air-handling unit size for
face velocities from 250 fpm to 600 fpm.  The author

www.info.hotims.com/49806-2
12

ASHRAE JouRnAl

ashrae.org

J u ly 2 0 1 4

considered the first cost and the energy cost as derived
from the pressure drop characteristics of intake louvers,
filters, cooling coils, unit casings and fans for operation at 3,120 and 8,760 hours/year.  We subsequently
described this technique in detail in the course book
that accompanied the above seminar.
In the years since 1982, we have used this technique
extensively in evaluating not only air-handling unit
selections but also the selection of water chillers, cooling towers, fans and pumps.  The technique is equally
at home handwritten on an engineering pad as on the
computer using spreadsheet calculations.
Gerald J. Williams, St. Louis

The Author Responds
Thank you for the historical background on the
subject. I agree that Arthur E. Wheeler's article "Air
Handling Unit Design for Energy Conservation" was a
landmark article that shows sufficiently informed engineering practices are not subject to obsolescence.
Kent Peterson, P.E., Presidential/Fellow ASHRAE, Long Beach, Calif.

www.info.hotims.com/49806-23



ASHRAE Journal - July 2014

Table of Contents for the Digital Edition of ASHRAE Journal - July 2014

Contents
ASHRAE Journal - July 2014 - BB1
ASHRAE Journal - July 2014 - BB2
ASHRAE Journal - July 2014 - Cover1
ASHRAE Journal - July 2014 - Cover2
ASHRAE Journal - July 2014 - 1
ASHRAE Journal - July 2014 - 2
ASHRAE Journal - July 2014 - Contents
ASHRAE Journal - July 2014 - 4
ASHRAE Journal - July 2014 - 5
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ASHRAE Journal - July 2014 - I1
ASHRAE Journal - July 2014 - I2
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ASHRAE Journal - July 2014 - Cover3
ASHRAE Journal - July 2014 - Cover4
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